Screw cap



FIG. 1 illustrates a front perspective view of the screw cap showing my new design;

FIG. 2 illustrates a top elevation view thereof;

FIG. 3 illustrates a front elevation view thereof;

FIG. 4 illustrates a right side elevation view thereof;

FIG. 5 illustrates a back elevation view thereof;

FIG. 6 illustrates a left side elevation view thereof; and,

FIG. 7 illustrates a bottom elevation view thereof.

The broken lines in the drawings depict environmental subject matter only and form no part of the claimed design. 

The ornamental design for a screw cap, as shown and described. 